CastDetailsView: Add more UI support for cast controller details view

- Make sure that the details view title and subtitle is updated
  correctly, based on whether we should show a chooser or controller UI.
- Add an icon and disconnect button for the cast controller UI.

Bug: 378514236
Flag: com.android.systemui.qs_tile_detailed_view
Test: CastDetailsViewModelTest, CastDetailsViewContentTest
Change-Id: Id3d616235b6635229b095191020cfb2cf3bbf7dd